Teachers&#39; correction pen



June 7, 1966 c. D. CORPIAN 3,254,836

TEACHERS CORRECTION PEN Filed Sept. 5, 1964 I 1 I e5 Six DEPRES PCHNT To EE.G\STEIZ E IXVENTOR.

United States Patent 3,254,836 TEACHERS CORRECTION PEN Claire D. Corpian, Rte. 3, Box 36, Boscobel, Wis. Filed Sept. 3, 1964, Ser. No. 394,136 4 Claims. (Cl. 235-64) This invention relates to ball point pens.

A principal object of the present invention is to provide a ball point pen for use by teachers during the process of correcting homework and examination papers and wherein the teacher usually employ a system of placing check marks upon the paper indicating which problems the student has wrong, the teacher then adding up the number of check marks to determine the grade for the paper.

Another object is to provide a teachers correction pen having self contained means whereby the pen will keep a visual score of the number of check marks made upon a paper, thereby eliminating the necessity of the teacher adding up the same. I

Still another object is to provide a teachers correction pen having self container means wherein a counting mechanism is activated each time that the pen point is depressed against a paper to produce a check mark thereupon.

Still another object is to provide a teachers correction pen having self contained means to easily and quickly reset the count-ing device after correcting each individual pupils paper.

Other objects are to provide a teachers correction pen that is simple in design, inexpensive to manufacture, rugged in construction, easy to use and eflicient in operation.

These and other objects will be readily apparent after a study of the following specification and the accompanying drawing wherein:

FIGURE 1 is a side elevation view of the pen incorporating the invention.

FIGURE 2 is a cross sectional view through 2--2 of FIGURE 1.

FIGURE 3 is a similar view with certain parts additionally shown in cross section.

FIGURE 4 is a crosssectional view through 4-4 of FIGURE 3.

FIGURE 5 is a cross sectional view similar to 'a part of FIGURE 3, shown in an alternate position.

FIGURE 6 is a top end view, and

'FIGURE 7 is a cross sectional view through 7-'7 of FIGURE 2.

Referring now to the drawing in detail, the numeral 1t) represents a teachers correction pen according to the invention wherein there is a casing 11 comprised of I conical end cap '12, lower sleeve 13, supper sleeve 14,

and upper end cap 15.

A conventional refill ink cartridge 16 extends out of the lower end of cap 12, the cartridge having a fixed protrusion or collar 17 against which one end of compression coil spring 1 8 bears; the opposite end bearing against shoulder '19 of sleeve 16. The upper'end of cartridge 16 bears against a hard bearing 20 aflixed in opening -21 of a longitudinally slidable block 22.

The block has a keyway 23 which is slidable on a key 24 fixed on sleeve 14 thereby preventing rotation of block 22. The upper end of the block has a circular ten-tooth ratchet gear 26 fixed on a rotatable rotor 27. A compression coil spring 28 between the gears normally keeps them disengaged. The rotor has a cylindrical portion 29 having ten indents 30 which are engageable by a conventional spring loaded detent 31 preventing carefree rotation of the rotor except when the detent-force is overcome by the mechanism being presently described. An-

3,254,836 Patented June 7, 1966 other cylindrical portion 32 on rotor 27 has ten visible numerals 33 imprinted thereupon as shown in FIGURE 2.

A knob 34 is .affixed to the end of the rotor and rotates therewith. An opening 35 extends through portion 32 and a pin 36 is slidable therein, the lower end being selectively engageable in any of ten openings 37 in a collar 38. The pin 36 has an enlarged head 39 under which one end of a leaf spring 40 extends the leaf spring opposite end being fixed between knob 34 and the portion 32, and the leaf spring normally urging the pin upward out of disengagement with any of the openings 67. A cam 41 on end wall 42 of cap 15 forces the pin downward at one point 43 which is approximately 36 long in arcuate length, opening 37 when the rotor is rotated a single turn. Thus during this period the collar rot-ates 36 with the rotor thereby advancing the numerals 44 on collar relative to the numerals 33 on the rotor. An opening 45 on end cap 15 allows view of a numerical digit on the rotor and collar so to obtain a reading. It is understood additional mechanism may be provided to attain a higher numerical reading.

In operative use when the cartridge is depressed during writing, the gear 25 lifts to engage gear 26. As shown in FIGURE 2 the teeth are slightly ofiset so that on engagement the gear 26 is rotated until the next numerical digit appears in opening 45. On the tenth move the pin rides under cam 41 causing one numerical digit advance on the collar.

To reset the device to a zero reading, the knob is simply rotated rapidly backward, causing the rotor and collar to rotate until the zero digits are in view. The device is then ready to re-use.

While various changes may be made in the detail construction, it is understood such changes will be in the spirit and scope of the present invention as defined in the appended claims. I

Having thus described my invention, I claim as new and desire to secure by Letters Patent of the United States:.

1. In a pen the combination of a longitudinal housing, an ink cartridge retained longitudinally slidable within said housing, one end of said cartridge extending out of one end of said housing, a compression coil spring between a shoulder of said housing and an intermediate collar on said cartridge normally urging said cartridge downward, the upper end of said cartridge bearing against a longitudinally slidable block, a rotatable rotor within the opposite end of said housing, a second compression coil spring between said rotor and said block, said block carrying a circular ten-tooth ratchet gear on an end adjacent said rotor, said rotor carrying a corresponding ten-tooth ratchet gear on an end adjacent said block, said second compression coil spring normally urging said ratchet gears apart, the teeth of said gears facing each other, the teeth of one gear being slightly offset from the teeth of the other gear, means to maintain the offset condition of said teeth when the teeth of bot-h gears are disengaged from each other, and a numbering mechanism carried by said rotor and an opening in said housing to permit visual reading of said num'bering mechanism.

2. In a pen the combination as set forth in claim 1 wherein said numbering mechanism comprises a cylindrical portion on said rotor carrying ten numerical digits on its cylindrical wall, a rotatable cylindrical collar adjacent said cylindrical portion, said collar having similar numerical digits on the cylindrical wall, said cylindrical portion of said rotor carrying a longitudinally slidable pin therethrough, said collar having ten circularly a ranged openings in engageable alignment with said pin, spring means normally urging said pin out of engagement with said openings, a cam fixed within said housing, said are advanced one digit relative to said numerals on said rotor during each one rotation of said rotor.

3. -In 'a pen the combination as set -forth in claim 2 wherein a knob is attached to an opposite end of said rotor, said .knob protruding outside of the end of said housing whereby said numbering mechanism may be reset.

4. In a pen the combination as set forth in claim 3 wherein said maintaining means includes a detent in said housing and an indent on said rotor, said detent in said housing being engageable With said indent on said r0- tor, said indent comprising ten circumferentially spaced apart notches selectively engageable with said dent, whereby said rotor may be maintained relatively fixed between operation and allow reading of numerical digits.

References Cited by the Examiner UNITED STATES PATENTS 488,206 12/ 1892 Judd. 1,007,350 10/1911 Goodin 23564 1,167,179 1/1916 Hires. 1,940,164 12/1933 Levin 235117.1 2,357,940 9/ 1944 Du Lude 235-64 X 2,967,356 1/1961 Morehead 235117 X 3,123,291 3/1964 Madry 23564 X FOREIGN PATENTS 85,928 10/ 1958 Denmark.

LEO SMILOW, Primary Examiner.

L. MARTIN, Assistant Examiner. 

1. IN A PEN THE COMBINATION OF A LONGITUDINAL HOUSING, AN INK CARTRIDGE RETAINED LONGITUDINALLY SLIDABLE WITHIN SAID HOUSING, ONE END OF SAID CARTRIDGE EXENDING OUT OF OEN END OF SAID HOUSING, A COMPRESSION COIL SPRING BETWEEN A SHOULDER OF SAID HOUSING AND AN INTERMEDIATE COLLAR ON SAID CARTRIDGE NORMALLY URGING SAID CARTRIDGE DOWNWARD, THE UPPER END OF SAID CARTRIDGE BEARING AGAINST A LONGITUDINALLY SLIDABLE BLOCK, A ROATABLE ROTOR WITHIN THE OPPOSITE ENF OF SAID HOUSING, A SECOND COMPRESSION COIL SPRING BETWEEN SAID ROTOR AND SAID BLOCK, SAID BLOCK CARRYING A CIRCULAR TEN-TOOTH RATCHET GEAR ON AN END ADJACENT SAID ROTOR, SAID ROTOR CARRYING A CORRESPODING TEN-TOOTH RATCHET GEAR ON AN END ADJACENT SAID BLOCK, SAID SECOND COMPRESSION COIL SPRING NORMALLY URGING SAID RATCHET GEARS APARTS, THE TEETH OF SAID GEARS FACING EACH OTHER, THE TEETH OF ONE GEAR BEING SLIGHTLY OFFSET FROM THE TEETH OF THE OTHER GEAR, MEANS TO MAINTAIN THE OFFSET CONDITION OF SAID TEETH WHEN THE TEETH OF BOTH GEARS ARE 